Table 1 CO₂-USA urban greenhouse gas monitoring networks.

Boston^30,31

8

CO₂, CH₄, CO

50%₂₀₀₅ by 2030 & net zero by 2050⁵⁵

http://atmos.seas.harvard.edu/lab/index.html

Indianapolis^{17,18,32,33,34}

14

CO₂, CH₄, CO

Net zero by 2050⁵⁶

http://sites.psu.edu/influx/

Los Angeles³⁵

12

CO₂, CH₄

50%₁₉₉₀ by 2025, 73%₁₉₉₀ by 2035, & net zero by 2050⁵⁷

https://megacities.jpl.nasa.gov/

Washington D.C./Baltimore⁴⁶

13

CO₂, CH₄

Baltimore: 15%₂₀₁₀ by 2020⁵⁸

https://www.nist.gov/topics/northeast-corridor-urban-test-bed

D.C.: 50%₂₀₀₆ by 2032 & 80%₂₀₀₆ by 2050⁵⁹

Portland³⁶

3

CO₂

50%₁₉₉₀ by 2030 & net zero by 2050⁶⁰

http://web.pdx.edu/~arice/CO2_PDX.html

Salt Lake City^{37,38,39,40,41}

7

CO₂, CH₄

50%₂₀₀₉ by 2030 & 80%₂₀₀₉ by 2040⁶¹

https://air.utah.edu/

San Francisco (BAAQMD^*)⁴²

4

CO₂, CH₄, CO

Net zero by 2050⁶²

https://www.baaqmd.gov/about-air-quality/air-quality-measurement/ghg-measurement

San Francisco (BEACO₂N^†)⁴³

65

CO₂

Net zero by 2050⁶²

http://www.beacon.berkeley.edu/

Toronto^44,45

4

CO₂, CH₄, CO

30%₁₉₉₀ by 2020, 65%₁₉₉₀ by 2030, & net zero by 2050⁶³

https://www.canada.ca/en/environment-climate-change/services/climate-change/greenhouse-gases-aerosols-monitoring.html